Piston.



PATENT canton.

DAVID W. PORTEROF CHARLESTON, WEST VIRGINIA.

PISTON.

Specification of Letters Patent.

Patented sept. 10,1918.

Application led July 18, 1917. Serial No. 181,330.

To au w/Lom it may concern Be it known that l. I).\vm lV. PoRTnR, a citizen of the UnitedffStates. residing at Charleston. in the county of Kanawha and State of -West Virginia, have invented new and useful Improvements in Pistons, of which the following is a specification.

y This invention relates to engine pistons,

.and comprehends the provision of a novel construction of means whereby the packing rings about the piston can be conveniently adjustedor expanded to compensate for the wear of the rings, thus insuring good compression, and maximum power from the motor. j

The nature and advantages of the invention will be better understood from the following detail description when read in connection with the accompanying drawing, the invention residing in the construction, combination and arrangement of-- parts as claimed.

In the drawing forming part of this speciication like numerals of reference indicate similar parts in the several views and wherein Figure- 1 is' a vertical 'sectional view through the piston constructed in accordance with my invention.

Fig. 2 is a transverse sectional view therethrough.

Fig. 3 is a detail view of one of the adjusting members. v

Fig. 4 is a transverse sectional view taken on line 4 4 of Fig. l.

The piston is indicated generally at A and comprises an enlarged lower portion or base 10 from which rises a centrally dis posed stem 11. The base lOvis provided with a socket 12 for the reception ot one end of the piston rod (not shown), but which is held associated with the piston through the' instrumentality of the pin 13. Thev upper surface ofA the base 10 is provided with a' plurality of radially disposed slots 14, which receive the widest extremity of the stem 15 of the adjusting members clearly shown in Fig. 3. Each of the 'adjusting members embody a stem 15 having av tapeled/,j'edge 16 While the opposed edge 17 which isperfectly straight has-associated therewith an arcuate shaped blade 17,l thus giving to the adjustable member a substantially-T-shaped formation in'cross section. These adjusting members are supported upon the uppersur- Eagle of the base 10 .and are disposed so that With the stems 15 arranged in the .slot 14 circumfer- Y entiaL movement of the members with respect to the stem 1l is obviated. The members are arranged upon the base 10 of the piston in a 'manner whereby the edge 16 has its tapered surface extending from the stem 11 at an appropriate point in its length up,- wardly and outwardly toward the extremity ,of the stem as clearly shown in Fig. 1. Slipped upon the `stem 11 is a cone-shaped element in cross section 18 the latter being fitted in the space between the stem 11 and the tapered edges 16 ,of the adjusting members. Subsequent to the positioning of the cone-shaped member in this manner, the packing rings 19 are spaced about the adjustmg members as shown. The adjusting members are of usual construction and of a resilient nature, but to assist in the expansion bore communicates with a relatively large bore 23 disposed above the .small bore and opening at one end of the stem. 'An eXteriorly threaded sleeve 2-1 is secured within the small bore 22, with a kportion ofthe sleeve projecting centrally within the large bore 23. The stem is provided with spaced el'ongatedslots 25 which are disposed parallel with the bore 22 and communicate therewith while the sleeve 24 is provided4 with-.alined openings 26 which are also disposed in registration with the slots 25,:jfand with 'a transverse opening 27 in a threadless bolt 28 which is slidably fitteduwithin the ffsleeve 24. When the cone-shaped element 18 is fitted upon the stem 1 1 it isrotated to bring the alined openings 29 thereof in registration with the slots 25 of the stem, and a key 30 is subsequently passed through the coneshaped element, the stem` 11, sleeve 24 and 'bolt 28, an' arrangement which provides for :in adjustment of the Cone-shaped nieinber simultaneously with the adjustnient of the bolt Q8. idani'tiestly when the bolt QS is moved Afarther within the sleeve 2i, the none-s raped element is moved in the saine direction and (.,foifierates with the tapered edges 1G of the adjusting nieinherst to lforce the .latter outwardly with a View oi" expandingr the packing rings 19 to eonijgiensate tor the wear thereof.

wll'hile the bolt may be adjusted in various ways, l pre erabljfy malte use ot a nut 3l which threaded upon that portion of the sleeve 2l positioned within the en-- larged bore 23 olf the Stein. The nut is pio vided with a reduced eXti-iriorly threaded portion 32 whieh terminates to provide an inwardly directed annular tlange 233, and upon which flange reposes the head of the bolt thus supporting ta boit `tor sliding adjustment in the sleeve iii. when the mit 3l is rotated as will iiwnliljY under` stood. An interiorly threat. Ul cap li threaded upon the reduced poi-tion 32 ot the nut ino cooperates with the llaiige l-' to prevent easiial th-iiangeniem oiu the holt 2S, or movement thereotl iinlependentli.4 ot the nut The, stein A ll projects an appreciable listanee above the adjusting members and npperniost packing ring if), and this portion ot the stein is exteriorly'threaded to areoniniodate the piston head with a threaded opening as shown. A head is also provided with a nlnrality oic diainetrieallyr opposed tliieadeetl mees-ses 2id which receive the shanks of threaded tasteningr elen'ients 3'? which latter -are passed through openings in a plate Bei for securing' the latter upon the piston head -i and elosing.T the central opening; tl'i ein.

ln' prs etico, when the pfnflzine; rings l?? have depreciated in size as the result of wear, thus bringingV about a lr; s of compresw sion in niotii'e power, the hind ot the ern gine cylinders can be reniored and the plate 3S si'iiisequentllr separated Vtrom the head 3:3 oi the piston, thus allowing access to he had tothenut 3l. turning the nut a slight distance toithe'right, the' cone-shaped ete nient 18 is foreed dowiii'ardlji, through the instrumentality of the bolt i?? which provides a, connection between the nut 3l and said cone-shaped element. Obviously, as the none-shaped element is moved downwardly it operates with the inclined edgee lo of the adjusting; members. to torce the latter outward with a consequent expansion ot' the packing rines to insure goed conipression, and inaxiiiiuin power Vfrom the inotor. The, plate "lo is then replaced as also the head ot' the engine cylinders. The construction is not 'only simple. but proi'ides'a means ii'liereb)r the packing' rings van be elinienicntlj' expanded for the pur pose intended, in mieli order.

llvliile it is believed that Vtroni the Vtore- ;oinej description the nature and adi'antaeies ot the invention will be readily apparent, l desire to have it understood that what is herein shown and described constitutes the preferred embodiment ot the invention to which l do not limit myself. and that such changes mayv be resorted to when desired as `tall witliin the scope of what is claimed.

li'iiat is claimed isz-- l. piston o'lE the character described eoniprising' a base formed with an upstanding` reduced stein portion. said stein being hollow tor a portion ot' its length, a tubular member disposed within the hollow portion, a plnialitiY o't wedp'ihshaped adjustable ineinliers surrounding` said stein and supported upon the base` a cone-shaped elenient interposed bei ween the stein and adjustable meinliers. a bolt slidalily titled within said tubular member and wholly disposed within said steni. a connection between the bolt and the. cone-shaped member whereby movement of the latter is controlled by said loolt, a` nut adjnstalili' mounted upon the tubular iiieinbei' and eonstitiitiiig a support for said bolt, and a 'ap associated with the said nut for holding the bolt positioned with respect to the nut lor nioiv'einent therewith.

piston of the eliaracter described eoinprising a base7 having; an upstanding centrally disposed stein portion, a plurality ot wedge-shaped members surroui'iding said stein and mounted upon the base. a eoneshaped element slidably fitted upon the stein and interposed between the latter and said adjustable members, said stein being' hollow for a portion ot' its leiigrtli, means wholly dispos-:fd uithin the hollow portion ot the stein tor eit'ectiiigg n adjustment ot the eene-shaped element. said stein projecting an appreciable distance above thl adjustalile ineinl'iers `and exteriorly threaded. a piston head threaded upon the projected portion ot the steun and a plate detachably secured to said piston head and closing the upper extremity of the stein.

ln 'testiinonjY ii'hereoi'l l attix my signature.

Diillll) lV. POltllilll. 

